Milling machine



JlIne 23, 1931. H., E MORTQN 1,811,363

MILLING MACHINE Filed May 22. 1929 7 Sheets-Sheet l ttonnm June 23,1931.

H- E- MoR'roN MILLING MACHINE 7 Sheets-Sheet 2 Filed May 22', 192g June23, 1931. H. E. MoRToN 1,811,363

MILLING MACHINE Filed Ma 22. .1929 7 sheets-sheet s w .www m @N NN $1. fj/or//J :y f

June 23, 1931. H. E. MoRToN MILLING MACHINE Filed May 22. 1929 7Sheets-Sheet 4 m m N n, u, l- Ls N m m S1 .am @N @N G llilwm mm ML mm.QN m l I l ww 1|l| I .NII!! Il I mW N U RN i NN .QN

June 23, 1931. H. E. MORTON 1,811,363

MILLING MACHINE Filed May 22. 1929 7 sheets-Sheet 5 f Mm mm um n .Il I-I June 23, 1931. H E; MQRTON 1,811,363

MILLING MACHINE Filled May 22. 19129 7 Sheets-Sheet v6 atroz/Magd H. E.MORTON June 23, 1931.

MILLING MACHINE Filed May 22. 1929 7 Sheets-Sheet 7 @AWN gwuanofv j/ezzWOW/027,

Patented June 23, 1931 MILLING MCHINE Application filed May 22,

This invention relates to that class of machines known as millingmachines and more particularly to a machine especially adapted forfinishing railway-car bearing-brasses,

:5 such as disclosed inV Patent No. 1,261,432,

dated April 2, 1918.

The present linvention aims to facilitate the handling of suchcomparatively heavy pieces of work, increaseV production and give .110greater accuracy in operation. A further object is to provide eiiieientcontrol of the machining operations and afford quick adjustment thereof,together with an arrangement providing semi-automatic operation. It isalso an object `to provide automatically operating means for accuratelypositioning and holding work of the character described and to providecertain other new and useful features in theV construction, arrangementand combination of elements, all as hereinafter more fully set forth. v

With the above and other ends in view, the invention consists in thematters hereinafter described and more particularly pointed out 5 in theappended claims, reference being` had to the accompanying drawings inwhich Figure l is a `planview of a machine illustrative of an embodimentof the present invention and showing portions broken away and insection;

Fig. 2 is an enlarged cross-section detail of clamping jawssubstantially upon the line 2 2 of Fig. 1;

Fig. 3 is an enlarged sectional detail show- 5 ing an adjustable stopplate for locating work endwise;

Fig. 4 is a side elevation of themachine with portions broken awa-y7 andin section substantially upon the longitudinal center line of themachine;Y n Y Fig. 5 is a transverse section upon the line 5 of Fig. 4;

Fig. 6 is a perspective view `of a piece of work machined by themachine;

Fig. 7 is a transverse section upon the line 7--7 of Fig. 4;y

Fig. 8 is asimilar section upon the line 8 8 of'Fig. 4; A

Fig. 9 is a longitudinal sectional detail 53 upon the line 9-9 of Fig.1; Y

1929. Serial No. 355,187.

Fig. 10 is an enlarged longitudinal sectional detail of a milling tooland adjacent parts of the machine Fig. 11 is a transverse section of themachine similar to that of Fig. 7 but loolring in the opposite directionand with parts broken awa-y to more clearly disclose the constructionFig. 1 2'is a detail showing stop mechanism in elevation and adjacentparts of the machine in section;

Fig. 13 isa side elevation of said stop mechanism and showing adjacentparts in section;

Fig. 14 is a sectional detail on the line 14-14 of Fig. 7;

Fig. 15 is an enlarged plan view of that portion of the machine adjacentthe cutting tool and worlr carrier, said figure showing a modificationof or addition to the machine for adjusting the cutting tool;

Fig. 16 is a section substantially upon the line 16-16 iof Fig. 15;

Fig. 17 is a section on the line 17-17 of Fig. 15; and

Fig. 18 is a vertical longitudinal section substantially upon the line18-18 of Fig. 15 through the milling or cutting tool and adj acent partsof the machine.

This machine is particularly adapted for milling or finishing toaccurate dimensions,

Babbitt lined bearing-brasses for railway car journals, such asillustrated in Fig. 6 of the drawings, it being essential that theover-all length of the body A be maintained within certain predeterminedlimits, the end faces B of the body properly machined relative to theend faces C of lugs D projecting laterally from the body, and thethickness of kthe concave wall of the body, plus the Babbitt lining E,accurately limited and the lining properly machined.

To perform this work, amilling cutter 1 of the proper dimensions isprovided, comprising a series of blades 2 for milling the concavehabbitted surface E and end cutters 3 and 4 for forming the end surfacesB and rounded corners where these surfaces .join the Babbitt surface.The ends ofthe blades 2 are beveled, as more clearly shown in Fig. 10,and collars 5 are formed with a corresponding cutters 3 and 4 areclamped in place upon the ofthe shaft 7 w sleeve between the collars 5and collars 9 on the sleeve.

A supporting frame comprises two spaced apart pedestals and 11 which areconnectedY at their lower ends by a base member l2 and intermediatetheir ends by plates 13 which tie the pedestals together and frombetween these plates, a vertical guide-way'for a vertically reciprocablehead or frame 14. On the upper ends of the pedestals 10 and 11 areprovided bearings 15 and 16 respectively for the ends hich is thussupported to eX- tend across the spacebetween the pedestals and carrythereon within this space and directly above the vertically reciprocableheadV 14, the milling cutter 1. l I

The pedestal 10 forms a gear boxfor a train of gears for driving themilling-cutter shaft 7, there being alarge gear 17 keyed lto a tubu-ylar bearing member 18 (see Figi 10) whichin turn is keyed to the shaft7, said shaft eXtending through the bearing member and made adjustablelongitudinally therein for adjust-y ing the cutter 1 endwise, byscrewthreading the shaft at each end of the member andprovidingadjusting nuts 19 and 2O onthe shaft in engagement with theends of said member 18. A hollow drive shaft21 (see F ig. 9) is mountedin suitable bearings on the pedestal with its ends projecting beyondthese bearings, and mounted upon one end of this shaft to r,turn freelythereon is a driving clutch member 22 of a multiple disk clutch uponwhich member 22 a driving pulley 23 is keyed. A driving clutch member 24is keyed upon the end vof shaft 21 and the usual friction disks 25 arecarried by these members and arranged in the usual manner'to transmitmotion from the driving to the drivenmember when said disks are broughtinto frictional engagement by means of aseries of pivoted bell cranklevers V26 arranged in the Ausual manner Vto be operated by means of aconel 27 slidable upon the projecting end of said shaft 21 and movedendwise by a rod 28 passing through the hollow shaft, to engage the endsof said bell cranks and spread said ends apart to rock said levers andbring the disks into frictional contact with leach other.

Within the casing formed by the ypedestal 10, is a pinion 29 keyed tothe shaft 21 (see Figs. 8 and 9) and vmounted on an intermediate shaft30 is a. large gear 31 in mesh with the pinion 29, with a second pinion32 on said shaft 30 lin mesh with the large gear 17 on the shaft 7 ofthe milling cutter. Driving power fromk the pulley 23 is thustransmitted through the multiple disk clutch to shaft 21 and from saidshaft by means of the gear train, to the shaft of the milling cutter. N

To move the rod 28 endwise for the purpose of operating the clutch andconnecting the drive pulley to the shaft 21, an operating yoke lever 33is pivotally supported intermediate its ends upon a suitable bracketradjacent the end of` the shaft 21, opposite thatto which the clutch isconnected, and the yoke of this lever is operatively connected to' acone 34' rotation of the milling cutter, as soon as the transmission ofpower from the pulley 23 is stopped bythe disengagement of the clutch.The lower end of the lever 33 is connected by a rod 36 `lo a crank arm37 on a cross shaft 38 mounted in bearingson the pedestal and extendingtransversely through said pedestal. An operating hand control lever 39is secured onthe projecting end of the shaft 38 for turning the same andthusl stopping or starting the machine and controlling the rotation ofthe cut-ter byoperating the clutch. i

Mounted in'suitable bearings on the pedestals 10 and ll'and'ektendingacross the space between the' same and into the hollow pedes;- tal 10,is a rock shaft 40, andmounted in suitable bearings in the pedestal is acam shaft 41 exteiiding'parallel with the crank shaft.

@n the cam shaft within the pedestal is a cam 42 and on the rock shaft40 is an arm 43v (Figs. 7 and 8) carrying a roller 44V to ride upon thecam. Motion is transmitted from a pinion 45 (Fig. 10)' formed on thetubular member 18y to turn there ith when the cutter shaft 7 is rotated,by means of a train of gearingv shown in dotted lines in Fig. 8 andhoused within a'suitable housing 46 (Fig. 4) on the outer side of thepedestal 10. Therefore when thelmachine is started by means of the lever39 which operates the multiple disk clutch 25 and causes thetransmissionof power from the drive pulley 23 to the member 18 carrying the pinion45, power will also be transmitted at the proper relative speed to turnthe cam shaft 41, which inv turn transmits a rocking motion to therockshaft 40 by the engagement with the cam 42 thereried by a fixed heador closure 49,- (Figs. 4,v

7 and 14) for the lower end of the guideway formed between the plates 13and adjacent I y free ends of the arms 50.

sides of the pedestals 10 and 11, for the vertically reciprocable head14, and this head 14 is rigidly secured to the upper end of said plunger47 to be moved vertically in its guideway by said plunger. To transmitmotion from said rock shaft to said plunger 47, a pair of spaced apartarms 50 is secured to said shaft with their free ends extending at eachside of the lower end of the plunger which is provided with a trunnionsleeve 51 adjustably held in place on the plungerl by collars 52, saidtrunnion sleeve being formed with laterallyV and oppositely extendingtrunnions upon which are pivotally mounted the lower ends of links 53,the upper ends of which links are pivotally connected to the To vary theupward stroke of the plunger 47 relative to the swinging movement of thearms 50 and thus vary the height to which the plunger and head 14 willbe raised, eccentric bushings 54 (see Fig. 14) are interposed betweenthe links 53 and the trunnions and these bushings are provided, eachwith a laterally extending arm, with these arms connected together by ayoke 55 by means of which the bushings may be. turned to adjust thelinks relative to the aXis of the trunnions and thus in eect, lengthenor shorten slightly the link connection between said armsand plunger andraise or lower the plunger relative to said arms. A pawl 56 is carriedby the yoke and a ratchet 57 is secured tothe sleeve 51 to hold the yokeand bushings in the position to which they may be rotated by theadjustment of the yoke. The upward limit of the stroke of the head 14may therefore be quickly and accurately adjusted to vary the distancebetween said 'head and milling cutter 1 when the head is at the'extremeupper end of its stroke.

To limit rotation of the cam shaft 41 and automatically release theclutch 25 to stop the machine, a stop lug or pin 58 is provided. on thecam 42 to engage a dog 59 on a short shaft 60 mounted in bearings in thepedestal 10 and projecting through the same wall of the pedestal as theshaft 38 (see detail Figs. 12-13) and on the outer end of this shaft 60is an arm 61 connected bya connecting rod 62 to the free end of a likearm 63 (see Fig. 4) on the projecting end of shaft 38 upon which theoperating or control hand lever 39 is mounted. Therefore when the hand-lever 39 lis operated to throw inthe clutch 25 and start the machine,motion will `simultaneously be imparted through the connecting rod 62 toturn the shaft 60, which turning of said shaft will throw the dog 59 upinto the path of the stop pin 58 on the cam42, so that when said cam hasmade a complete revolution, the pin will engage the deg and rotate theshaft 60 in an opposite direction and through the connection of saidshaft to theshaft 33,*automatically throw out the clutch and stop theoperation of the machine.

To yieldingly hold the shaft 60 in the position to which it is `turnedwith the clutch 25 either in or out, a yielding toggle device isprovided consisting of a pair of parallel arms 64 secured to the shaft(30, a rod 65 pivoted between the free ends of said arms at one end andhaving a sliding connection with a ball 66 at its opposite end with aspring 67 sleeved on VAthe rod be 'ween said ball and adjusting 4nuts 68on the rod, said ball being mounted head 14 comprising two formed blocks70 se- 1 cured together by end plates 7l, said blocks being slidable incontact with the connecting plates 13 ferming 'he sides of theway forthe head, and the plates 71 being in sliding ccntact with end surfacesof the adjacent ends of the `pedcst-als 10 and 11 which form the ends ofsaid vertical guideway. rlhe adjacent inner faces of these blocks areformed with semi-circular seats for clamping members 79 which are formedsemi-circular in cross-section to seat within said seats as clearlyshown in Fig. 7 and each clamping member is pro vided with a fixedclamping jaw 73, each comprising a block firmly bolted as at 74 in placewithin a notch or recess in the upper part of each clamping member. Aroughened grip or face plate 75 is secured within a groove in the faceof each jaw to engage the sides of the bearing brass and hold it inposition while being milled, and these grip or face plates are so heldthat they may be adjustable endwise for the pu 'pose of properlylocating the work, the forward ends of said plates being arranged toengage `the faces C of the laterally extending lugs D. To so at justablyhold these plates, (see Fig. 3) bolts 7G pass through elongated holes inthe aws, and an adjusting screw 77 is provided to engage the rear end ofeach plate so that said plates may be accurately adjusted and thus '.1

ferm accurate stops against which the work is located.

The work is properly located laterally between the jaws by means shownin detail in Fig. 2 comprising an adjustable stop screw 78 carried byone jaw 73 at one side of the work and a yieldable stop pin 79 carriedby the opposite jaw and engaging the opposite ride of the work, saidstops being pesitioned toward the rear end portion of the bearingbrassor that portion adjacent the end opposite that provided with the lugs D.

- rhe work or each bearing-brass is lirmly seated in a V-block 8O (see Fig. 2) comprising pairs oi independently adjustable members each formedwith a single inclined seat to oppose a lili-e inclined seat- On theother member of each pair, themembers of each pair together providing aseat having oppositely inclined surfaces between which the work isseated, said inclincs engaging the inclined lower sides of thebearing-brass. rlhese members of each pair are adjusted laterally ot thework by means of adjusting screws 8l Vcarried by a carrier block 82 andengaging opposite sides ot a lug 83 on each member'projecting centrallythereof downwardly into an opening in the carrier block. rllhe il-blockmay, therefore be accurately adjusted laterally to bring the verticalaxial plane ot the bore or Babbitt lining E of the work into coincidencewith the verticalaxial planev ofthe milling cutter l. Preferably thelugs 83 are undercut toward the members oll the lf-block so that thesemembers will be rmly held down uponthe lcarrier block S2 by theengagement of the ends of said screws with the'upwardly and opppositelyinclined or undercut sides of the lugs. f

f A plate or bed 8l is tirmlybolted or otherwise secured at its Vendstothe end plates 7l of: the head lll, said end plates being cutaway V ornotchedinwardly from their upper ends shown in ll to receive saidbedrplate and vto also permit of endwise sliding of the carrier bloek 82from the bed through such opening, said carrier block being unsecured tothis bed and tree to slide longitudinally therefrom, the clampingmembers 72 being also cut away at their adjacent sides as shown in Fig.2 to provide for said bed plate and carrier block, and at the same timepermit limited rotative movement of said clamping members in their seatsin theblocks for the purposeof moving the jaws 73 toward each other andclamping therebetween the work supported on the V-blocksSO and carrierblock 82. As this bed plate 84 is rigidly secured to the verticallyreciprocatable head lll, it rises and falls with the head, carrying anywork positioned on the carrier block up intormilling position andlowering it therefrom. c y

To turn the clamping ymembers 7 2 and 'clamp the work between the jaws'.73 in timed 'relation to the vertical movements of the verticallyreciprocable head lll, each clamping member is provided with adownwardly eX- tenued arm85 and pivoially attached at one end to thelower ends of these arms, are links 86, which links are in turnpivotally attached at their opposite ends to a head 87- secured upon theupper end of a rod 88 longitudinally reciprocablel through a bushing 89secured within the upper open end of the bore of the plunger 47, (seeFie. 7). vThe head 87 is guided' between opposed surfaces on the blocks70 of the head 14 for accuratecsliding movement7 and saidrod 88 isofsuch a length that when the head 14 is lowered by the plunger, said endof said rod which projects from the lower end of the plunger, will comeinto contact with the base `member l2 before the head reaches the lowerend of its stroke and thus stop the rody prior to the head reachinglimit7 and thusa tnroughfthe linkconnection of the rod with the arms 85,turn said clamping members 2 and open the jaws to release the work. p

Upon upward movement of the head 14,- the jaws will at once start toclose due to the tact that the rod remains in contact .with the Y basel2 throughout the rst portion of the upward movement of the head 14: andwhile the lll and thus turned by their link connection with the head ofthrerod,y said rod being yieleingly held by a coiled spring 9() sleevedthereon in thel bore of the plunger 47 between the inner-end of thebushing 89` and a piston 91 on the rod vworking in theplunger bore.llilhen the head S7 on the rod seats upon the upper end or" the upwardlymoving plunger 47, said rod then rises ywith the head lil but the jawsby this time have been turned into movement of head lll, will `be heldin that clamping position,Y and upon further upward jaws are beingcarried up bythe headY position by the action of the Sprin'gQO.V A

cushioning edect ony the closing and-opening of the jaws is securedthroughthe operation of the piston 91 inthe bore vof the plunger 417.

The work is thus accurately centered laterally and firmly clamped inplace upon the head ll to movetherewith. into milling position so thatthe bore E of a bearing-brass will be accurately milled to the exactoverall length and thickness of wall and in proper relationto the lugs Deach time a-'brass is placed upon the V-block 80 and raised into contactwith the milling cutter by the operation or" the cam .l2 which is causedto make one revolution in raising the head la and loweringthe'same tothe limit .of its movement wherethe machine is automatically stopped 'bythe operation of the lstop pin 58 on the cam coming into engagement withthe dog 59. This cam l2 is so shaped as to gradually litt the head la tothe limit of its upward movement and hold it in that position, therebeinga dwell in the cam7 and Vthen the cam drops oil rapidly, causing aquick lowering of the head to the eXtreme lowerend of its movement whereit is stopped by the automatic stopping of the machine. Y Y

`When the carrier block 82 is in place upon the bed or head plate 84' of,the vertically movable head 14 and accurately located thereon, it islocked against possible endwise movement after `the head starts to rise,by a locking bar 92 mounted for vertical endwise movement in a groove orway in the head to be projected upwardly through an opening in the plate84 into an opening 93 (see Fig. 4) provided therefor in the bottom ofthe carrier block 82, and this locking movement of said bar is effectedby means of a rocker-bar 94 (see lp 11) which is pivotally supportedintermediate its ends within a recess in the head 14 with one endengaged within a slot or notch in the lower end of the locking bar andits opposite end within a notch in a vortically reciprocable plunger 95,which plunger is mounted for r-eciprecation within a bore in one of theblocks or castings forming the head with said bore opening through thebottom of the head so that said plunger may project therefrom when thehead is raised away from the closure head 49 for the lower end of theguide way for the reciprocable head 14. A. spring 96 operates on theupper end of the plunger to project it from the bore as soon as the head14 is lifted and thus rock the rocker-bar 94 and raise the locking bar92 into the opening 93 in the carrier block to firmly lock said carrierin place against endwise movement on the vertically reciprocable head.When the head approaches the lower end of its stroke, the plunger 95 isbrought into engagement with the bottom or head 49 of the guideway andis pressed inward thereby, rocking the rocker-bar and thus re tractingthe locking bar from the carrier block just before the head 14 reachesthe lower end of its stroke.

To facilitate the placing of the bearingbrasses, one at a time upon thecarrier block 82 'and then placing this block upon the plate 84 of thevertically movable head in position to be lifted toward the millingcutter, a table or horizontal guide-way 97 in the form of a longbracket, is secured to one side of the pedestal 11 to extend outwardlytherefrom with said way in the horizontal plane of the upper surface ofthe` plate 84 when the head 14 is at the eXtreme lower end of itsstroke, and mounted on this guideway to reciprocate freely thereon is acarriage 98 having a longitudinally extending end tongue 99 of T-form inplan view adapted to fit into a vertically disposed channel way 100formed on the adjacent end of the carrier block 82 to receive andinterlock with the tongue on the carriage so that movement of thecarriage along its way will pull or push the carrier block, sliding saidblock onto or oif from said head, and by reason of the form of interlockbetween carriage and block, permitting the block to be lifted verticallyout of engagement with the carriage by the upward movement of thelifting head 14.

The carriage 98 is guided in its guideway 97 lin any suitable manner andwhen moved to the outer end of said way, will drag the block with italong the way to a point opposite Ythe end of a loading table 101 whicheX- tends at right angles to the way and upon which several brasses maybe placed and slid, one at a time, onto the V-block 80 mounted on thecarrier block 82, the finished brass on the carrier being removed as theunfinished brass is put in place.

To facilitate the moving of the carriage and carrier block along theguideway 97, said carriage is connected as by a bolt 102 (see Fig. 4) toa link of a continuous chain 103 which is led over a pair of sprockets104 to form a run of the chain extending the length of the guidewaydirectly below the same, said chain also extending over a large sprocket105 on a shaft 100 which shaft has also secured thereto a small sprocketover which another ychain 107 passes, said chain 107 passing around alarge sprocket on a second shaft 108 on the outer end of which a handcrank 109 is secured for turning its shaft and imparting motion to thecarriage through the chain 103. An adjustable stop screw 110 is providedfor limiting the turning movement of the hand crank in one direction andlimit the movement of the carriage, and a. stop 111 is provided at theouter end of the guideway 97 to limit the movement of the carriage inthe opposite direction.

l/Vhen the carrier block is pushed endwise by the carriage, intoposition upon the head 14, said block is accurately positionedlongitudinally by coming into contact at its inner end with a stop 112located in a recess in the vertical way for the head, and said block islocated laterally by passing through the cutaway portions or notches inthe end plates 7l of the head, said block fitting between the sides ofthese notches, which sides 113 (see Fig. 11) engage, guide and hold theblock in place against lateral movement upon the bed plate 84.

By this arrangement, the loading and unloading of the machine is greatlyfacilitated as, when the machine is automatically stopped as previouslydescribed, the head will be in its lowermost position and in the planeof the guideway so that the carrier block may be readily pulled endwisefrom the head onto the way to a position where the work is readilyaccessible for removal and for the replacement of another piece, thismovement of the block being quickly effected by operating the hand lever109, the block being coupled to the carriage 98 to move therewith, andthis coupling of the carrier block to the carriage being automaticallyeffected by the lowering of the block by the head 14 into alignment withthe carriage. The uncoupling of said block and carriage is likewiseeffected by the lifting of the block vertically by the head, thecarriage remaining in position to `again e'ect coupling when the head islowered after the milling operation has been completed. y The operatormay find that, due to slight Variations in' wall thickness of the castbrasses, it is necessary to change the upward stroke of the plunger 47slightly and thus on certain pieces, cause the head 1 4V to approach afew thousandths nearer the milling cutter or to stop a few thousandthsfarther away, and to quickly effect such regulation, he will swing theyoke one orrmore notches up or down as the case may be, thusk rotatingthe eccentric bushings 54 and lowering or raising the plunger and headrelative to the operating arm 5() which have a fixed throw.

The operator may also find that the cast brasses vary somewhat in lengthand may therefore require that a greater or less amount of metal beremoved from one of the end faces B. To provide'for such adjustment, amodified construction of milling cutter is shown in Figs.' 15, 16, 1'?and 18, the

endv critters 4 being mounted upon an outer sleeve 114 in anyrsuitablemanner with this outer sleeve splined for longitudinal movement upon aninner sleeve 115 which is secured against longitudinal movement upon thesha t7 to turn therewith, an adjustable collar 116 being screwed uponthe end of the inner sleeve against the end of the outer sleeve to limitits longitudinal movement. By moving the outer sleeve endwise, thecutters 4 are also moved to increase orl decrease the cut forming theend face B of the bearing brass.

To thus adjust the cutters 4, the sleeve 114 is moved longitudinally bymeans of a yoke 117 embracing the sleeve and operatively/:con-

nected thereto in the usual manner, said yoke being pivotally supportedintermediate its ends upon an eccentric pivot pin 118 which is clampedagainst turning within a split bearing 119 therefor, said yoke beingpivote'd to turnfreely upon eccentric end portions 120 o f the pin, sothat by slackening the clamping bolt 121 said pin maybe turned in saidbearing yto change the position of the axis vof pivotal support for theyoke and secure an adjustmentof thev throw of the yoke relative toitspivotal connection to the sleeve. The arms 122 of the yoke projectingbeyond the bearing l119 are formedV with longitudinal slots 123 andextending through these slots are end portions 124 of an voperating pin125 mounted for free rotationin a bearing 126 betweein said arms, saidend portions 124 being formed eccentric to the bearing portion of saidpin 125 so that whensaid pin ris turned by means of a handle 126 on thepin, the yo-ke will be swung upon its pivot and move the sleeve 114 andcutters 4 the few thousandths of an inch required. A slight increase ordecrease in the over-all length of a particular bearing brass maytherefore beregulated at will bythe operator, and in order that theVcutters maybeautomaically returned to their original setting after:finishing that yparticular piece, said hermespin 125 is formed with gearteeth 127 which are engaged by a rack 128 slidable in one directionwithin a suitable housing or way 129 against the'action of a coiledspring 130 in the housing exerting a force upon the end of the rack tomove it in a. direction opposite to that in which the rack is movedbyengagement with the teeth 127 on the operating pin 125, when said Ypin is turned' by means of the handle 126. Therefore, immediately uponrelease of the handle 126 by the operator, said spring 130 will act toreturn the handle to normal position and thereby return the cutters totheir original setting determined by the adjustment ofthe pin 118 andalso by the collar 116. Y i

The present machine is particularly adapted for machining Babbittedbearing brasses for railway cars and is oonstructed'to greatlyfacilitate thework bymaking the Vmachine semi-automatic inits operation.The loading and unloading ofthe machine is expedited by providing amovable carrier block for the work and hand operated means for movingsaid block into and outv of operative position, so that the finishedwork may be conveniently removed and new work accurately positioned. Thepositioning and removal of the work is also facilitatedby providinothevertically movable head for carrying the work up to the milling cutter,and this placement and removal is accomplished vwhile the machine is atrest, it having been automatically stopped after the completion ofthemilling operation, but the accurate locatf ing of the work ismechanically effected and is therefore exact, insuring accuracy inmachining. But while the machining operation is automatic, adjustmentmay be eected to take care of variations in the dimensions of thecastings and therefore a uniform product is secured. l f

VObviously. changes may be made within the scope of the appendedclaims,`in the construction, arrangement and combination o-f theseverall elements embodied in the present machine, without departingfrom the spirit of the present invention, and I do not, therefore limitmyself to the particular construction shown.

Having thus lfully described my invention, what I claim is 1. A millingmachine including a milling cutter, means for rotating said cutter, avertically movable head beneath said cutter, a work holder on said headremovable therefrom, a horizontally reciprocable member to interlockwith said holder when said holder is in lowered position, means forreceiving said member, and means for raising and lowering said head.

2. A milling machine including a horizontally disposed cutter, means forrotating said'cutter, a vertically reciprocable head, beneath saidcutter, a removable work holder iso Cil

Lei Lees on said head, means for reciprocating said head, means operableto automatically stop the movement of said head at the lower end of eachstroke of the head, a member for removing said holder from said head,means for connecting said member and holder when said head is in loweredposition and for disconnecting the same when said head is raised, andmeans for moving said member to remove said holder from said head whensaid head'is at the lower end of its stroke.

3. ln a milling machine, the combination of a horizontally disposedmilling cutter, a vertically reciprocable head beneath said cutter, awork holder carried by said head, means for transmitting motion torotate said cutter including a clutch and for reciprocating` said headincluding a cam to impart a varying reciprocation to said head, a rigidmember on said cam having a fixed position relative rto the workingsurface of said cam, and means operated by said member on said cam foroperating said clutch to stopA the transmission of motion.

4. ln a milling machine, the combination of a horizontally disposedmilling cutter, a vertically reciprocable head, a work holder carried bysaid head and freely removable therefrom, means adapted to interlockwith said holder when said head is moved to the end of its stroke and tomove said holder from said head clamping jaws pivotally carried by saidhead at each side of said work holder when in place on the head andadapted to clamp work carried by said holder, means for reciprocatingsaid head, and means operated by the reciprocation of said head foropening and closing said jaws.

5. In a milling machine, the combination of a horizontally disposedmilling cutter, a vertically reciprocable head beneath said cutter, apair of jaws carried by said head, means operatedin timed relation tothe reciprocation of said head for opening and closing said jaws, a workholding block on said head between said jaws and removable therefromwhen said head is at the lower end of its stroke and said jaws are open,and a horizontally reciprocable member for moving said block onto andolf said head and adapted to interlock with an end on said block at thelower end of the stroke of said head and to be disengaged therefrom bythe up-movement of said head.

6. A milling machine as characterized in claim 5, and furthercharacterized in that said means for removing said block from said headincludes a horizontally movable member and a coupling for connectingsaid member and block, said coupling being operated by vertical movementof said head to couple or uncouple said block and member.

7. A milling machine as characterized in claim 5 and including ahorizontally disposed track, a member movable along said track, andmeans for coupling` said member to said block, the coupling of saidmember to said block and the disconnection thereof being automaticallyeffected by the vertical reciprocation of said head.

S. A milling` machine as characterized in claim 5 and including ahorizontally disposed track extending laterally from said head and inthe horizontal plane of the upper surface of said head when said head isin lowered position, a member movable along said track, manuallyoperable means for moving said member along said track, and interlockingmembers on said block and member arranged, one to receive the other whensaid head is moved vertically.

9. ln milling machine, the combination of a horizontally disposedmilling cutter, a vertically reciprocable head beneath said cutter, adownwardly extending plunger upon which said head is mounted, a guidefor said plunger, a horizontal shaft extending beneath said head and atone side of said plunger, a crank arm on said shaft, a link connectingsaid arm and plunger to raise said plunger and head, a cam for impartinga varying movement to said shaft and a pivotal connection between saidlink and plunger, including an eccentric and means for adjusting saideccentric.

10. In a milling machine, the combination of a support provided withbearings, a horizontally disposed milling cutter mounted in saidbearings, power transmitting means for imparting rotation to saidcutter, a vertical guideway beneath said cutter, a head reciprocable insaid guideway toward and from said cutter, jaws pivotally mounted insaid head, a work holding block carried by said head between said jawsand removable therefrom in a direction longitudinally of said cutter,means at the lower end of the stroke of the head for moving said blockendwise from the head, means for accurately positioning said block onthe head to locate the work relative to the cutter, and motiontransmitting means for transmitting motion from said power transmittingmeans to reciprocate said head, said motion transmitting means includinga cam for imparting a varying reciprocating motion to said head.

11. 1n a milling machine, the combination of spaced apart pedestalshaving bearings, a

'rotary milling cutter mounted in said bearings and extending across thespace between said pedesials, a vertical guideway between said pedestalsbeneath said cutter, a head reciprocable in said guidewa-y, a pair ofwork clamping jaws pivotally mounted in said head, arms on said jaws forturning the same, a tubular plunger upon the upper end of which saidhead ismounted, a rod extending through said plunger, link connectionsbetween the upper end of said rod and said arms on said jaws, ahorizontal shaft extending aerossthe machine between said pedestals atone side of said plunger, crank arms on said shaft, links connecting thefree ends j, of said crank arms and said plunger, a spring 5 to resistrelative. longitudinal movement of said rod and plunger, means to engagethe projecting end of said' rod prior to the yplunger reaching the lowerend of its stroke to move said` rod relative'to the plunger and operatesaid jaws, saidjaws being'rotated in the opposite directionby saidspring upon upward. movement of said plunger, gearing within one of saidpedestals for transmitting motion to said cutter, a shaft fortransmitting f5 lmotion to operate said plunger through said horizontalshaft and crank arms, a cam on said motion transmitting shaft, an arm onsaid horizontal shaft to engage said cam, and lmeans carried bysaid camfor stopping its h0 rotation atthe end ofeach rotation thereof.

12. In a milling machine, the combination :of a horizontally disposed'milling cutter, a yertically reciprocable head beneath said cutter, apair of work clamping jaws pivotally 25 mounted in said head, a carrierblock for carrying work, said lhead being formed with a guideway forsaidblock between said jaws, means operated by movement of said head forrotating said jaws, means for moving said '30 block in said guideway intimed relation to the reciprocation of said head, locking means for saidblock operated in timed relation to the movement of said'head, by thereciprocative 'movement of said' head, a tubular :sa plunger to theupper end of which said reoiprocable head is secured, and meansconnected to'said plunger to raise and lower said reciprocable head.

In testimony whereof I aHiX my signature.

' HENRY E. MORTON.

